1. Liquid Crystals: the Fourth State of Matter, F.D. Saeva, Ed., Marcel Dekker, New York (1979).
2. D. Demus,Mol. Cryst Liq. Cryst, 165, 45–84 (1988).
3. Liquid Crystals: Applications and Uses, 2vol., B. Bahadur, Ed., World Scientific, Singapore (1990/1991).
4. P.J. Collins,Liquid Crystals, Nature’s Delicate Phase of Matter, Princeton University Press, Princeton (1990).
5. Tribology and the Liquid-Crystalline State, G. Biresaw, Ed., ACS Symposium Series 441, American Chemical Society, Washington (1990).